The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 12, 1992
Filed:
Nov. 01, 1990
Arnold J Cook, Pittsburgh, PA (US);
PCast Equipment Corporation, Pittsburgh, PA (US);
Abstract
A porous preform is placed within a permanent, nonporous, thin walled mold chamber. The mold chamber is disposed within a pressure vessel. A material is placed in a crucible of the pressure vessel. The pressure vessel is evacuated through a snorkel fluidically connected to the mold chamber. There is means for cooling the snorkel in thermal communication with the snorkel. The material is melted within the crucible. The crucible is placed in fluidic communication with the mold chamber such that the melted material seals the inside of the mold chamber from the pressure vessel to isolate a vacuum within the mold chamber. Finally, the vessel is pressurized at a controlled rate such that the pressure in the mold chamber is able to have time to be driven towards equilibrium with the vessel and therefore allowing differential pressure control while the mold chamber is continually evacuated such that the melted material is drawn into the mold chamber and seals the snorkel by forming a solidification plug and the melted material is forced into the porous preform.